“The Computer History Museum has made the source code for Photoshop 1.0.1 into an exhibit that lets the public, or at least programmers, appreciate the inner workings of the historic software,” Stephen Shankland reports for CNET. “The museum published the software yesterday, following up on its earlier release of the source code underlying Apple’s original MacPaint.”

“Source code is what humans write — in Photoshop 1.0’s case the brothers Thomas and John Knoll,” Shankland reports. “The initial Photoshop is written in written 128,000 lines of code, a combination of the high-level Pascal programming language and low-level assembly-language instructions. When converted to machine code, the program was small enough to fit on a floppy disk.”

Shankland reports, “Photoshop started in the 1980s as a personal project the brothers called Display…”